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成都平原河渠密布,沿江河一级阶地,超河漫滩及古河道(已改造为条田)分布着类型多样的灰潮沙土(俗名沙田),由于产量不高,对平原大面积平衡增产带来一定影响.国内外一些研究者对沙土的改良多从改造土壤质地,质地剖面或以高分子聚合物作土壤结构改良剂着手,由于耗劳多,投资大,难以大面积推广.作为一种随现代化大农业的发展而兴起的新型耕作制度—免耕法,已在不少国家加以应用或推广.水田少耕法的研究应用虽较晚,但发展很快,特别是日本,实行水田少耕最早,研究也较系统,深入.我国东北、华北近年来在水田少耕方面作过较多研究与推广、南方稻田少耕也取得了不少研究成果,但从改造沙田淀浆板结缺点而进行的少耕并未引起重视.
There are many types of gray-tidal sand (commonly known as Shatin) distributed in the plains along the river, a series of riverside terraces, super-floodplains and ancient rivers (which have been transformed into strips). Due to the low output, Influence.Many researchers at home and abroad to improve the sand and more from the transformation of soil texture, texture profile or polymer structure as a soil structure improver to start, due to labor-intensive, large investment, it is difficult to promote large-scale .As one with the modernization The new tillage system, the no-tillage method, has been applied or popularized in many countries due to the development of large-scale agriculture. Although the research on paddy field less-tillage method has been developed lately, it developed rapidly, especially in Japan. , And the research is more systematic and in-depth.Many researches and popularization have been done in paddy fields and less tillage in northeast and north China in recent years, and many achievements have been made in paddy field and paddy field in southern China. Plowing did not attract attention.